Just got my BNSF # 9718 two days ago and ran it for the first time last night. Runs and sounds good. The smoke output was pretty anemic even set at high. I'm letting it sit a day or so and will try the smoke unit again. Smoke is not a big deal for me on diesels as I rarely run the smoke units anyway. If the smoke output continues as it is, sometime down the line I may pop the shell off and re-pack the reservoir and check the resistor. I've re-built several smoke units in the past, so it is not something that makes me want to send the loco back to Lionel to troubleshoot if it continues. Other than that, it's a nice loco and I'm glad I added it to my roster.
Cheers!